A5003362874- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Pulsed Power Technology Applications
- Radiation Effects and Dosimetry
- Electrostatic Discharge in Electronics
- Advanced X-ray Imaging Techniques
- Magnesium Alloys: Properties and Applications
- Chemical and Physical Properties in Aqueous Solutions
- Metal Forming Simulation Techniques
- Wind and Air Flow Studies
- Crystallography and Radiation Phenomena
- Ga2O3 and related materials
- Glass properties and applications
- Radiative Heat Transfer Studies
- Iron and Steelmaking Processes
- GaN-based semiconductor devices and materials
- Metal Alloys Wear and Properties
- Thermodynamic properties of mixtures
- Electromagnetic Launch and Propulsion Technology
- Material Dynamics and Properties
- Solidification and crystal growth phenomena
- Smart Grid Energy Management
- Electric Power System Optimization
- Particle Detector Development and Performance
Pohang University of Science and Technology
2007-2024
Pohang Accelerator Laboratory
2007-2015
RWTH Aachen University
2000
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the resolution cavity position monitor (BPM) system, which part ATF2 diagnostics. Two types BPMs are used, C-band operating at 6.423 GHz, and S-band 2.888 GHz with an increased aperture. cavities, electronics, digital processing described. attenuators was determined to be approximately 250 nm 1 m system. Without attenuation best recorded 27 nm.
AbstractAbstractSubsurface hook formation during initial solidification in the continuous casting mould degrades quality of steel slabs owing to associated entrapment argon bubbles and non-metallic inclusions. To minimise depth improve slab quality, extensive plant experiments were performed analysed quantify effect parameters on characteristics using no. 2-1 caster at POSCO Gwangyang Works, Korea. The results reveal that meniscus heat flux plays an important role controlling...
General, dimensionless expressions are derived for the parameters describing thermo-mechanical behavior of roll-strip system, on basis boundary value problem associated with hot strip rolling. Then, it is shown that, by conducting process simulation an integrated finite element model, may be transformed into various on-line models which applied to precision set-up and control. The validity proposed approach examined through comparison predictions from simulation.
The enthalpies of dilution the binary system H2SO4 + H2O have been measured at temperatures (283.15, 293.15, 313.15, and 333.15) K using two different calorimeters. excess molar enthalpies, HE, are obtained from data. HE data reported compared to literature values.
Summary form only given. We designed a compact repetitive Marx generator. The generator contains 25 stages consisted with capactor banks and spark gap switches. used door knob ceramic capacitors. capacitors are charged through inductors by capacitor charging power supply. length the diameter of about 150 cm 60 cm, respectively. conducted preliminary test at condiction low voltage using helium gas. present characteristic discuss design issues such as insulation high feedthrough.
The Pohang-Accelerator-Laboratory X-ray free-electron laser (PAL-XFEL) emits intense, ultra-short pulses, enabling studies on ultra-small and -fast dynamics in various fields. We designed fabricated silicon p-intrinsic-n photo-diodes (PDs) to detect strong pulses. Four types of PDs were with different metal shapes the P- N-sides. fabrication process was split into two parts, based thickness Al anti-reflective coating (ARC) layers, evaluate feasibility detection performance. A beam test...
We designed a fast capacitive high voltage probe for Marx generator. Since the works on differential mode, we also passive integrator to integrate signals. tested probe's performance by using simple pulse generator simulate calibrated water load which act as resistive divider. present and discuss results of experiments.
A turbulent nonpremixed flame of H 2 /CO-air stabilized on a bluff-body is simulated by the conditional moment closure (CMC) model. Full spatial variation quantities taken into account for an elliptic recirculating flow field. Comparison has shown reasonable agreement and Favre mean temperature mass fractions CO 0 between calculation experiment. Overprediction peak OH fraction attributed to inaccurate modelling scalar dissipation rate. The CMC model capable predicting major features...
To drive cathode of Magnetron Injection Gun (MIG), long pulse high voltage power supply (HVPS) is needed. HVPS have to be few seconds continuously -40 kV, 280 kW with rise and fall time less then 1 ms, Included ripple stability HV output than 1%. In order develop HVPS, eight HVPSs are parallel operated by each phase shifted PI control. generation performed method ON OFF all gate pulse, simultaneity. Maximum current unit -40kV 1.2 A. this paper, we will discuss topology, simulation test results HVPS.
The Pohang Accelerator Laboratory (PAL) had started the 10 GeV PAL-XFEL project from 2011. needs a highly stable electron beam. very beam voltage of klystron- modulator is essential to provide acceleration field for an Thus, system XFEL requires less than 50 ppm PFN stability. To get this high stability on system, inverter type HVPS pivot component. And lower noise and smart. We discuss measurement test results pulse system.
We designed and fabricated a C-band standing-wave accelerating structure for compact industrial electron accelerator. It is capable of producing 4-MeV beams with 50-mA pulsed beam current. As an RF source, we use 5-GHz magnetron 1.5-MW peak power 0.08% duty factor. This bi-periodic operated the pi/2-mode standing-waves. on-axis coupled magnetic coupling slots on side wall. Each cavity in bunching normal cells by using MWS code. The coupler cell Omega3p code determining resonant frequency...